This is my second minifig-scale walker. As an imperial model, I made it for stormtroopers, and I read a lot about it on wookiepedia. It was often used in imperial assaults, such as the battle at Hoth(!?)and it is very useful against infranty and provides a relatively safe place for officers, so they can command the battle on the battlefield.
Maybe it's a bit big, but I tried to build it as accurate as I can...=)
About this creation
HEAD---I made this walker from a picture in the wookiepedia. As you can see, there is a side door on both side of the walker, here the pilot can leave it. I also made a cockpit in the top (I don't really know it is accurate or not) but it's easier to get access to the interior.
COCKPIT---Very comfortable, the cabine can accomodate one driver (thats why it called personal), you can see the weapon's place, strap, and the control panels.
LEGS---massive as always=)I made yellow elements on both legs.
WEAPONS---The AT-PT has a twin antipersonal lasercannon and a conclussion grenade launcher (bottom of the walker)